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第25届中国控制与决策会议

作者： Zhang Xinran Lu Chao Han Yingduo State Key Laboratory of Control and Simulation of Power System and Generation Equipments Tsinghua University

ISBN: (纸本)9781467355339

In this paper, the impact of stochastic time delay on wide-area damping networked control systems is analyzed. A disintegrate method of time-delay upon sampling period is approved. Furthermore, the expectative model of networked control systems with long and stochastic time delay, whose variance extent is larger than one sampling period, is theoretically proved and calculated. Finally, the effectiveness of this expectative model is confirmed on the simulation of a power system with 8 generators and 36 nodes.

关键词： Networked control system, Wide Area Damping control, Long Stochastic Time Delay, Expectative Model.

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Low-carbon power grid index system and evaluation method

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Dianli Xitong Zidonghua/Automation of Electric power systems 2014年第17期38卷 157-162页

作者： Sun, Yanlong Kang, Chongqing Chen, Songsong Meng, Junxia Lu, Chang Luo, Jinshan Department of Electrical Engineering Tsinghua University Beijing100084 China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Tsinghua University Beijing100084 China China Electric Power Research Institute Beijing100192 China State Power Economic Research Institute Beijing102209 China

The importance of establishment of the low-carbon power grid index system and its comprehensive evaluation model for the development of the low-carbon power grid is firstly discussed. Based on the concept of life cycle analysis, a comprehensive low-carbon power grid index system and a more refined central index system are designed in consideration of different aspects of coverage, and the meaning of each index explicated in detail. Furthermore, a comprehensive evaluation method is designed for the quantization of the low-carbon developing condition of different power grids. Finally, an example analysis is conducted based on the statistical data of some domestic power grids to demonstrate the actual application of the evaluation model. © 2014 state Grid Electric power Research Institute Press

关键词： Electric power transmission networks

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Open Architecture and Its Implementation of power system Numerical simulation Software

Open Architecture and Its Implementation of Power System Num...

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2014 International Conference on Artificial,Intelligence and Software Engineering(AISE 2014)

作者： Wen-xin LYU Xin-huan JIANG Qun XU Heng-xu ZHANG Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Qingdao Power Company Shandong State Grid Corporation of China

An open architecture of power system numerical simulation software is proposed, the interface information between simulation engine and user program is exchanged by Client/Server implementation. The open application program interface is realized by establishing an identical and standardized database(a normalized function interface table) on both sides so that they can understand each other through table searching. The client-side secondary development is not limited to single programming language. Interface software packages have been developed for different programming languages including C++, Matlab and Python. It is verified that the proposed framework has powerful openness as well as flexibility, which will greatly improve the calculating and analyzing capabilities of the power system numerical simulation software.

关键词： power system Numerical simulation Application program interface(API) Open architecture

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A Method to Calculate the Change of Turbine power Output Caused by the Condenser Pressure Adjustment

A Method to Calculate the Change of Turbine Power Output Cau...

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2014 International Conference on Energy, Environment and Materials Engineering(EEME 2014)

作者： Wei WANG Yong HU De-liang ZENG State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control and Computer EngineeringNorth China Electric Power University

It is necessary to acquire the relationship between the turbine power output and condenser pressure under the certain steam load since the condenser pressure has a great influence on the turbine power *** paper first analyzes the varying parameters of the regenerative extraction cycle system caused by condenser pressure adjustment,and then sets up their calculating models through mechanism analysis and formula *** this basis,this paper attains the change of turbine power output caused by condenser pressure adjustment through the power expression.

关键词： Condenser pressure Turbine power output Steam-water distribution

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A coordination control strategy of voltage source converter based MTDC for offshore wind farms

A coordination control strategy of voltage source converter ...

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2014 IEEE Industry Application Society Annual Meeting, IAS 2014

作者： Ren, Jing-Guo Li, Ke-Jun Sun, Lijun Zhao, Jian-Guo Liang, Yong-Liang Lee, Wei-Jen Ding, Zhao-Hao Sun, Ying Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan250061 China State Grid of China Technology College Jinan250002 China Energy Systems Research Center University of Texas at Arlington ArlingtonTX76019 United States Shandong Electric Power Research Institute China

ISBN: (纸本)9781479922888

This paper proposes a coordination control strategy of voltage source converter based multi-terminal DC (VSC-MTDC) transmission system for integrating large-scale offshore wind power. Using a typical five-terminal DC transmission system as an example, coordination control strategy based on local controller among converter stations is proposed. Based on the DC voltage -Active power characteristic, improved control strategy for auxiliary converter station and APC converter station are proposed respectively. Also the working mode of the two converter stations is analyzed. The basis of parameter selection of auxiliary converter station and APC converter station is presented due to DC power flow distribution and maximum and minimum operational mode. Finally, simulations in PSCAD/EMTDC are conducted to validate the multi-point DC voltage control method under various operating state in normal, master converter station fault and auxiliary converter station fault conditions respectively. Results show that this method can guarantee the active power allocation of VSC-MTDC transmission system and good control effects are obtained. © 2014 IEEE.

关键词： Offshore wind farms

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Dynamic simulation based on Jacobian-free Newton-GMRES methods with adaptive preconditioner for power systems

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Science China(Technological Sciences) 2013年第8期56卷 2037-2045页

作者： HUANG ShaoWei CHEN Ying SHEN Chen MEI ShengWei State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments(Department of Electrical Engineering Tsinghua University)

Dynamic simulation is one of the most complex and important computations for power systems *** solutions based on normal Newton iterations almost all depend on evaluations of Jacobian matrixes,which increases the programming complexity of and limits the parallelizability of the whole *** this paper,a new adaptive preconditioned Jacobian-free Newton-GMRES(m)method is proposed to be applied to dynamic simulations of power *** new method has totally Jacobian-free characteristics,which saves calculations and storages of Jacobian matrixes and features strong ***,several speedup strategies are introduced to enhance efficiency and parallelizability of overall *** tests are carried out on IEEE standard test systems and results show that in series computing environment,simulations based on the proposed method have comparable speed to those based on classical Newton-Raphson methods.

关键词： dynamic simulation Newton-GMRES preconditioner power system

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Nanopowder production by gas-embedded electrical explosion of wire

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Chinese Physics B 2013年第4期22卷 350-353页

作者：邹晓兵毛志国王新新江伟华 State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Department of Physics and Chemistry College of Science North China University of Technology

A small electrical explosion of wire （EEW） setup for nanopowder production is constructed. It consists of a low inductance capacitor bank of 2 μF–4 μF typically charged to 8 kV–30 kV, a triggered gas switch, and a production chamber housing the exploding wire load and ambient gas. With the EEW device, nanosize powders of titanium oxides, titanium nitrides, copper oxides, and zinc oxides are successfully synthesized. The average particle size of synthesized powders under different experimental conditions is in a range of 20nm–80nm. The pressure of ambient gas or wire vapor can strongly affect the average particle size. The lower the pressure, the smaller the particle size is. For wire material with relatively high resistivity, such as titanium, whose deposited energy Wd is often less than sublimation energy W s due to the flashover breakdown along the wire prematurely ending the Joule heating process, the synthesized particle size of titanium oxides or titanium nitrides increases with overheat coefficient k （k = W d /Ws ） increasing.

关键词： electrical explosion of wire nanosized powders particle size

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Coordinated control strategy of air-conditioning loads for power system balancing

Coordinated control strategy of air-conditioning loads for p...

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International Conference on power system Technology (powerCON)

作者： Meng Liu Zhongkang Wei Xiaodong Chu Wen Zhang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Jinan China State Grid Jibei Electric Power Company Beijing China

In this paper a coordinated control strategy of air-conditioning load groups is proposed to help correct imbalances between load and generation, especially when the power system is under stressed conditions such as the loss of power generation. Firstly, a decentralized air-conditioning load group control strategy (control mode 1) is presented accounting for maintenance of load diversity, so that the large oscillations of aggregated power of load group caused by diversity loss can be avoided. However, there is an unwanted parasitic "power peak" in the control mode 1. To eliminate the negative effects of the "power peak", another load control strategy (control mode 2) is borrowed from the literature which requires to communicate with the control center. Both of the control modes 1 and 2 adopt a segmental load recovery scheme to avoid "recovery peak". Then, a coordinated load control strategy is presented to coordinate the control modes 1 and 2. The "power peak" in control mode 1 is used as the power control objective for the load group of the control mode 2, and the control signal for control mode 2 can be calculated using the dichotomy method. simulation results verify the effectiveness of the proposed coordinated control strategy of air-conditioning loads for power system balancing.

关键词： Load flow control Temperature control power systems Load modeling Frequency control Atmospheric modeling Oscillators

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"what We Breathe Impacts Our Health: Improving Understanding of the Link between Air Pollution and Health"

"what We Breathe Impacts Our Health: Improving Understanding...

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作者： West, J. Jason Cohen, Aaron Dentener, Frank Brunekreef, Bert Zhu, Tong Armstrong, Ben Bell, Michelle L. Brauer, Michael Carmichael, Gregory Costa, Dan L. Dockery, Douglas W. Kleeman, Michael Krzyzanowski, Michal Künzli, Nino Liousse, Catherine Lung, Shih-Chun Candice Martin, Randall V. Pöschl, Ulrich Pope, C. Arden Roberts, James M. Russell, Armistead G. Wiedinmyer, Christine Environmental Sciences and Engineering University of North Carolina at Chapel Hill Chapel HillNC27599 United States Health Effects Institute BostonMA02110 United States European Commission Joint Research Centre Institute for Environment and Sustainability IspraI. 21027 Italy Institute for Risk Assessment Sciences Universiteit Utrecht Julius Center for Health Sciences and Primary Care University Medical Center Utrecht Utrecht3584 CJ Netherlands State Key Lab for Environmental Simulation and Pollution Control College of Environmental Science and Engineering Peking University Beijing100871 China Social and Environmental Health Research London School of Hygiene and Tropical Medicine LondonWC1E 7HT United Kingdom School of Forestry and Environmental Studies Yale University New HavenCT06511 United States School of Population and Public Health University of British Columbia VancouverBCV6T 1Z3 Canada Chemical and Biochemical Engineering University of Iowa Iowa CityIA52242 United States Air Climate and Energy Research Program Office of Research and Development Environmental Protection Agency DurhamNC27705 United States Harvard T. H. Chan School of Public Health BostonMA02115 United States Civil and Environmental Engineering University of California at Davis DavisCA95616 United States Environmental Research Group King's College London LondonSE1 9NH United Kingdom Epidemiology and Public Health Swiss Tropical and Public Health Institute Basel Switzerland University of Basel Basel Switzerland Laboratoire d' Aérologie CNRS-Université de Toulouse Toulouse31400 France Research Center for Environmental Changes Academia Sinica Taipei Taiwan Physics and Atmospheric Science Dalhousie University HalifaxNSB3H 4R2 Canada Harvard-Smithsonian Center for Astrophysics CambridgeMA02138 United States Multiphase Chemistry Department Max Planck Institute for Chemistry Mainz55128 Germany Economics Brigham Young University ProvoUT84602 United States Ea

Air pollution contributes to the premature deaths of millions of people each year around the world, and air quality problems are growing in many developing nations. While past policy efforts have succeeded in reducing particulate matter and trace gases in North America and Europe, adverse health effects are found at even these lower levels of air pollution. Future policy actions will benefit from improved understanding of the interactions and health effects of different chemical species and source categories. Achieving this new understanding requires air pollution scientists and engineers to work increasingly closely with health scientists. In particular, research is needed to better understand the chemical and physical properties of complex air pollutant mixtures, and to use new observations provided by satellites, advanced in situ measurement techniques, and distributed micro monitoring networks, coupled with models, to better characterize air pollution exposure for epidemiological and toxicological research, and to better quantify the effects of specific source sectors and mitigation strategies. © 2016 American Chemical Society.

关键词： Health

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Decentralized Coordinated control of Hybrid Wind-thermal power system

Decentralized Coordinated Control of Hybrid Wind-thermal Pow...

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第三十三届中国控制会议

作者： Li Xiao ming Niu Yu guang Wang Shi lin Zhao Zi ang Lin Zhong wei School of Control and Computer Engineering North China Electric Power University State Key Laboratory for Alternate Electric Power System with Renewable Energy Source North China Electric Power University

ISBN: (纸本)9781479947249

Modern power system is a hybrid power system, which contains renewable power plants. In those power plants, wind farm has shown the world's fastest rate of growth. The reported researches about decentralized coordinated control of power system are all based on synchronous generator(SG). It is not suitable that applying this decentralized-coordinated method to a hybrid power system for that the wind-generated energy capacity has been reached a considerable level. Combining correlative measurement modeling and multiple model predictive control, this paper proposes a decentralized coordinated multiple model predictive control(DCM-MPC) for a hybrid wind-thermal power(HWP) system. The transient problems of wind power integration are discussed subsequently. A simple, generic HWP system is used to illustrate the contributions. The results show that the proposed DCM-MPC not only provides an accurate tracking performance, but also improves transient stability of the HWP.

关键词： doubly fed induction generator,synchronous generator,excitation control,decentralized-coordinated control,correlative measured method,transient stability,system damping

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